99997973 has 2 divisors, whose sum is σ = 99997974. Its totient is φ = 99997972.

The previous prime is 99997957. The next prime is 99997981. The reversal of 99997973 is 37979999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 96963409 + 3034564 = 9847^2 + 1742^2 .

It is a cyclic number.

It is not a de Polignac number, because 99997973 - 2⁴ = 99997957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99997913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49998986 + 49998987.

It is an arithmetic number, because the mean of its divisors is an integer number (49998987).

Almost surely, 2^99997973 is an apocalyptic number.

It is an amenable number.

99997973 is a deficient number, since it is larger than the sum of its proper divisors (1).

99997973 is an equidigital number, since it uses as much as digits as its factorization.

99997973 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8680203, while the sum is 62.

The square root of 99997973 is about 9999.8986494864. The cubic root of 99997973 is about 464.1557471732.

The spelling of 99997973 in words is "ninety-nine million, nine hundred ninety-seven thousand, nine hundred seventy-three".